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I2CCON 数据表(PDF) 126 Page - Microchip Technology |
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I2CCON 数据表(HTML) 126 Page - Microchip Technology |
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126 / 210 page  dsPIC30F2011/2012/3012/3013 DS70139G-page 126 © 2010 Microchip Technology Inc. 17.2 Oscillator Configurations 17.2.1 INITIAL CLOCK SOURCE SELECTION While coming out of Power-on Reset or Brown-out Reset, the device selects its clock source based on: a) FOS<2:0> Configuration bits that select one of four oscillator groups, b) and FPR<4:0> Configuration bits that select one of 15 oscillator choices within the primary group. The selection is as shown in Table 17-2. 17.2.2 OSCILLATOR START-UP TIMER (OST) In order to ensure that a crystal oscillator (or ceramic resonator) has started and stabilized, an Oscillator Start-up Timer is included. It is a simple 10-bit counter that counts 1024 TOSC cycles before releasing the oscillator clock to the rest of the system. The time-out period is designated as TOST. The TOST time is involved every time the oscillator has to restart (i.e., on POR, BOR and wake-up from Sleep). The Oscillator Start-up Timer is applied to the LP oscillator, XT, XTL and HS modes (upon wake-up from Sleep, POR and BOR) for the primary oscillator. TABLE 17-2: CONFIGURATION BIT VALUES FOR CLOCK SELECTION Oscillator Mode Oscillator Source FOS<2:0> FPR<4:0> OSC2 Function ECIO w/PLL 4x PLL 1 1 10 1101 I/O ECIO w/PLL 8x PLL 1 1 10 1110 I/O ECIO w/PLL 16x PLL 1 1 10 1111 I/O FRC w/PLL 4X PLL 1 1 10 0001 I/O FRC w/PLL 8x PLL 1 1 10 1010 I/O FRC w/PLL 16x PLL 1 1 10 0011 I/O XT w/PLL 4x PLL 1 1 10 0101 OSC2 XT w/PLL 8x PLL 1 1 10 0110 OSC2 XT w/PLL 16x PLL 1 1 10 0111 OSC2 HS2 w/PLL 4x PLL 1 1 11 0001 OSC2 HS2 w/PLL 8x PLL 1 1 11 0010 OSC2 HS2 w/ PLL 16x PLL 1 1 11 0011 OSC2 HS3 w/PLL 4x PLL 1 1 11 0101 OSC2 HS3 w/PLL 8x PLL 1 1 11 0110 OSC2 HS3 w/PLL 16x PLL 1 1 11 0111 OSC2 ECIO External 0 1 10 1100 I/O XT External 0 1 10 0100 OSC2 HS External 0 1 10 0010 OSC2 EC External 0 1 10 1011 CLKO ERC External 0 1 10 1001 CLKO ERCIO External 0 1 10 1000 I/O XTL External 0 1 10 0000 OSC2 LP Secondary 0 0 0X XXXX (Note 1, 2) FRC Internal FRC 0 0 1X XXXX (Note 1, 2) LPRC Internal LPRC 0 1 0X XXXX (Note 1, 2) Note 1: The OSC2 pin is either usable as a general purpose I/O pin or is completely unusable, depending on the Primary Oscillator mode selection (FPR<4:0>). 2: OSC1 pin cannot be used as an I/O pin even if the secondary oscillator or an internal clock source is selected at all times. |
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